I bought some micro files, which turned out to be rubbish. The blades were ok, but the handl was awful, so I made new handles and a holder for them. There's a fair bit of slop in the tangs of many of these files, so use either a scale or extrusion multiplier to get a good fit. I added a drop of loctite red into the handle when setting the blades.

The holder fits the back of my workbench (22mm thick). You may need to modify it for your setup.